Coin silver napkin rings, unmarked, Ca 1860/65

These are an interesting pair of napkin rings. They are 1 1/4" deep and 1 5/8" in diameter. One looks to have more detail in the engine turning than the other but it doesn't seem to be polished off, rather a manufacturing mistake. And that's not the only error. When cutting the scroll for the monogram, they cut a little too deep and there is roughness on the inside of one. They are also missing a monogram. Otherwise in nice condition. They are unmarked. Ca 1860/65.